PBS Cube question

[gottaluvlasers]

hey PL'ers-

2.45 Watts @532nm into my PBS. my reflected output at 90 degrees is 2.13 Watts. No other lasers in the mix right now. Just this one 532nm. im trying to figure out polarization. (i also have a 1/4 wave optic to change polariz. for the other laser).

this doesnt sound kosher to me. Any ideas?

[Laserman532]

hey PL'ers-

2.45 Watts @532nm into my PBS. my reflected output at 90 degrees is 2.13 Watts. No other lasers in the mix right now. Just this one 532nm. im trying to figure out polarization. (i also have a 1/4 wave optic to change polariz. for the other laser).

this doesnt sound kosher to me. Any ideas?

well if you see very little or zero going straight thru the PBS you have the polarization right...its just a crappy PBS...I am of course assuming your laser is polarized either exactly vertical or horizontal to begin with

and you are going to loose power with the 1/4 wave plate.

just think if you could sell all of those losses

[daedal]

hey PL'ers-

2.45 Watts @532nm into my PBS. my reflected output at 90 degrees is 2.13 Watts. No other lasers in the mix right now. Just this one 532nm. im trying to figure out polarization. (i also have a 1/4 wave optic to change polariz. for the other laser).

this doesnt sound kosher to me. Any ideas?

I dunno man... At 90% reflection, you get 2.205 out of a 2.45 input...

Either this is a horrible cube, or the polarization is just a tad bit off... have you tried rotating the cube to match the polarization a bit in either direction, and then slightly off the 90 degrees?

I'll tell you what... you send it to me, and I'll figure it out for you

--DDL

[gottaluvlasers]

lol-

thanks daedel!! i dont think EITHER laser is exact horizontal or Vertical. im losing about 20% through the cube with ONE laser mounted directly on the base plate.

things can NEVER go easy or roght for me!!

This was supposed to be an easy 1 hour setup for me. but Nooooooo....its gotta be dificult.



-Marc

[allthatwhichis]

You may have to use an X/Y mount for both the laser and cube to find the best angle for polarity.

[Laserman532]

I'll bet my tin foil hat that the laser is not exactly polarized (vertical or horizontal) in reference to its mounting base

a fun experiment is to take a round polarized laser (in an aixiz module for example) and rotate it in its mount and measure the reflected light from a PBS cube...it takes only a degree or two to become very leaky

(I know that 99% of you know this, but some others might not)